How much caffeine is bad for health?

Effects of caffeine

Many believe that about 400 mg of caffeine is just the right amount to enjoy its benefits without the side effects. However, it still depends on the person and how caffeine affects his or her emotional, physical, and mental wellness. Moderation is always best.

The Mayo Clinic state that consuming more than 500-600 mg of caffeine per day may cause health issues like insomnia, nervousness, restlessness, irritability, an upset stomach, a fast heartbeat and even muscle tremors. However, previous research has linked even moderate amounts of caffeine to negative health effects. Up to 400 mg of caffeine a day appears to be safe for most healthy adults.